panaflo L1A vs. M1A

ciz28 · Post by **ciz28** » Sun Jun 29, 2003 5:36 pm

i have a thermalright slk-800a with a panaflo L1A that can cool 100 watts of heat from a 1700+ palomino at 1.83ghz to 63c. i'm looking to overclock my new 1800+ thoroughbred to 2.5ghz (crossing fingers...) but it should theoretically put out upwards of 125 watts of heat! if i switch to a panaflo M1A instead of an L1A, will this be enough to compensate for the additional 25 watts of heat for the same temperatures?

wsc · Post by **wsc** » Sun Jun 29, 2003 6:47 pm

Personally, I would be pretty suprised if you were able to accomplish it. That is a massive overclock...

Vaeltaja · Post by **Vaeltaja** » Sun Jun 29, 2003 7:51 pm

I'm not sure whether this helps, but do you know how the Panaflo M1A and L1A compare to NMB 3610KL-04W-B40? It is rated at 47.67CFM at 12V, and I have a one running at 5V cooling a Tbred-B 1700+ (i.e. 1.45GHz) running at 2.4GHz. I would imagine that at 5V the NMB fan has less airflow than either of the Panaflos at 12V, but I could be thoroughly wrong.

As for the overclock, so far I've had two of the 1700+ varieties running at 2.5GHz, but only with the CPU fan at 12V. 2.4GHz is fine with 5V though

Vaeltaja · Post by **Vaeltaja** » Mon Jun 30, 2003 7:37 am

Ooops, I just noticed that I missed a few crucial details in the original post. That's what you get when posting all sleepy-like

I'm using an SLK-900U instead of SLK-800, and that NMB fan is a 92mm one instead of 80mm one. I have run the CPU @ 2.4GHz with an 80mm Yate Loon fan rated at around 19CMF (I think; it was one that came with our Chieftec cases) at 12V, with the SLK-900. I'm not sure how that scales to SLK-800, but I think it's promising.

ciz28 · Post by **ciz28** » Mon Jun 30, 2003 8:06 am

wsc wrote:Personally, I would be pretty suprised if you were able to accomplish it. That is a massive overclock...

well, i upped my voltage to 1.85 last night and it's stable in windows at 2.5ghz (166*15) but crashes in 3dmark03. i'm hoping that it just needs to be a little cooler, or else i'll have to look into a voltage mod. it is good news, though, that it at least runs at 2.5ghz....

Vaeltaja wrote:I'm not sure whether this helps, but do you know how the Panaflo M1A and L1A compare to NMB 3610KL-04W-B40? It is rated at 47.67CFM at 12V, and I have a one running at 5V cooling a Tbred-B 1700+ (i.e. 1.45GHz) running at 2.4GHz. I would imagine that at 5V the NMB fan has less airflow than either of the Panaflos at 12V, but I could be thoroughly wrong.

the L1A is rated at 1900rpm and 24cfm while the M1A is rated at 2500rpm and 32cfm. i currently have my L1A hooked up to the fan only connector on my antec 380s psu so the voltage ramps up to 12v when the cpu is under load. i assume the M1A would do the same, so i'd get the full 32cfm when i needed it.

basically what i'm wondering is if 24cfm is sufficient for 100 watts of heat with my slk-800a, is 32cfm sufficient for 125 watts of heat? how would i go about figuring it out?

Vaeltaja · Post by **Vaeltaja** » Mon Jun 30, 2003 1:34 pm

basically what i'm wondering is if 24cfm is sufficient for 100 watts of heat with my slk-800a, is 32cfm sufficient for 125 watts of heat? how would i go about figuring it out?

By trying it?

BTW, I seriously doubt your 1800+ @ 2.5GHz would generate 125W heat. Am I correct in assuming that you got that number from Radiate? I think Radiate's figures are a bit.. generous.

As I said, I've ran the 1700+ @ 2.4GHz with a 19CFM 80mm fan with an SLK-900. I would imagine that the SLK-800 would fare roughly the same, and maybe even better when coupled with a better fan.

ciz28 · Post by **ciz28** » Mon Jun 30, 2003 4:18 pm

Vaeltaja wrote:By trying it?

well, sounds like good advice to me! i'm going to play with the various fans that i have tonight when i get off work. hopefully i have something with similar specs that i can test with before i order an M1A.

Vaeltaja wrote:BTW, I seriously doubt your 1800+ @ 2.5GHz would generate 125W heat. Am I correct in assuming that you got that number from Radiate? I think Radiate's figures are a bit.. generous.

well, kinda. i got them from here, which i believe uses the same formula as radiate. even if the numbers are off, though, it seems that it might produce a decent comparison between my two overclocked scenarios. 25 watts doesn't sound like an unreasonable difference between a palomino @ 1.83ghz and 1.85v versus a thoroughbred @ 2.50ghz and 1.85v.

Vaeltaja wrote:As I said, I've ran the 1700+ @ 2.4GHz with a 19CFM 80mm fan with an SLK-900. I would imagine that the SLK-800 would fare roughly the same, and maybe even better when coupled with a better fan.

what core voltage were you using? i've run mine perfectly stable at 2.20ghz and 1.60v with my L1A.

Vaeltaja · Post by **Vaeltaja** » Mon Jun 30, 2003 6:17 pm

well, kinda. i got them from here, which i believe uses the same formula as radiate. even if the numbers are off, though, it seems that it might produce a decent comparison between my two overclocked scenarios. 25 watts doesn't sound like an unreasonable difference between a palomino @ 1.83ghz and 1.85v versus a thoroughbred @ 2.50ghz and 1.85v.

That I'm not sure about. From all I hear a Palomino runs significantly hotter than a Thoroughbred, so given the same voltage and all I would think they'd produce about the same heat. But that's just a shot-in-the-dark guess.. I'm too lazy to look through AMD's papers right now to figure out what the baseline difference is

Maybe shoot a question at Overclockers.com forums asking this?

what core voltage were you using? i've run mine perfectly stable at 2.20ghz and 1.60v with my L1A.

2.5V above stock, which in our case translates into 1.85V (we've the DUT3C processors; stock is 1.6V). One of the processors does 2.4GHz with lower voltage, but +2.5V is a nice baseline..

ez2remember · Post by **ez2remember** » Tue Jul 01, 2003 4:38 am

Are you sure you guys are in the right forums? LOL.

2.5Ghz Athlons must be atleast XP3500+?

How about getting a 80mm-120mm adaptor and sticking 120mm fan instead, that way you can be sure you have enough cfm.

ciz28 · Post by **ciz28** » Tue Jul 01, 2003 10:08 am

ez2remember wrote:Are you sure you guys are in the right forums? LOL.

2.5Ghz Athlons must be atleast XP3500+?

How about getting a 80mm-120mm adaptor and sticking 120mm fan instead, that way you can be sure you have enough cfm.

we can have speed and quiet, can't we??

i'm thinking that 3500+ might be a little bit of a conservative rating; maybe amd should take a hint? the chip is perfectly stable at 1.85v and 166*15, but that was tested with a delta 80mm 80cfm fan!

i really need to find a reasonable fan to keep this thing cool....